^^^This^^^. The 80 with 375,000 miles has had good PM, always 50:50 Toyota Red and distilled water, but now getting a new radiator. It'll also get a new OEM Thermostat. The current OEM Tstat appears to be working fine but it's now 12 years old so good time to replace it while the system is empty.
One of my 80's had the HG blow (under 100k) before I picked it up; the HG was replaced with the new design OEM HG. It's now at 375,000 miles with no signs of HG failure but it is time for valve stem seals.
Now if someone could come up with a new improved super...